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Recently we ran into a problem where our logging disappeared sometimes. This happened after switching to an HAProxy load balancer. After many hours and some wireshark sessions we found an incorrect setting in HAProxy and apparently left out some important configuration in Logback. Idle connections were killed by HAProxy and we didn’t know there was a way to see that this happened.
This article may also be interesting when you run into disappearing or stale connections with HAProxy.

Properly setting up your logging is not as trivial as many people think. The big problem is that many people will stop worrying about their logging setup once they see logging output. There is a chance you forgot about the output of a few other logging libraries you transitively got into your project. This article will show you which libraries to use or exclude to prevent missing log statements. Then I’ll show a method to fail your build when a conflicting library accidentally crept into your project.